Rotary motor.



P. J. DARLINGTON.

ROTARY MOTOR. 'APPLIOATION FILED man 17. 1007.

Patented Oct. 15, 1912.

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INVENTO wlTN Essss P. J. DARLINGTON.

ROTARY MOTOR.

APPLIOATION FILED JUNE 17. 1907..

Patepted Oct. 15, 1912.

M@ 'im Qu am WITNESSES mvENToR P. J. DARLINGTON.

ROTARY MOTOR.

APPLIOATIUN FILED JUNE 17. 1907.

1,041,040. Patented Oct. 15, 1912.

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WITNESSES INVENTOR tlteri ATENT OFFICE.

PHILIP J. 3JARLING'J5ON. 0F EITTS'BUHGH, PENNSYLVANIA.

ROTARY MOTOR.

Specification of Letters Patent.

Patented Oct. 15,1912.

.Application filed June i7, 1.907. Serial No. 379,508.

Rotary Motors, ot' which the tollmvingr is a .tull, clear` and exact description, reference being.' hat to the accompanyinel drawings, :torintng' part ot this specification, in

arcs l, i?, 3 and flare longitudinal sections ot' one. forni oitl motor embodying' my invention, ta'len on the lines lwl, l`l --ll', lllilwlifi and iVm-U7, respectively ot Fig'. Fig. 5 is a cross-section on the line V-V ot1 3; and Fig. G is a longitudinal section showing a modified form ot' the motor.

'll/.ly invention relates to the class of rotary motors, and more particularly to a motor of this kind designed to be passed through boiler tubes to actuate a drill 'or other tool iter the removal ot scale troni the interior oit the tubes, altl'lough it may be used 'tor other uirposesi 'lhe object ot' my iilvention is to provide a motor ot this character which is simple and inexpensive in its construction; which can be readily adapted to di'tl'erent sizes of boiler tubes; and wl'lich can be `retn'lily and cheaply inspraxted and repaired.

it.. 'further 'object is to increase the etlicieney and durability ot' the motor, and to provide means whereby itean be readily started. and stopped 'without tho necessity for signaling; an as, slant at sonic distant point.

Other 'nn'auftai'tt advantages and objects of my invention will be lureinat'ter pointed ont.

Alilith those objects in view. the invention consi; I# in, various norcl features ot voir stroef on, viiinihiz'iatione: and arrangement oit the parte which will i. best understood tlt-r'criptioi'i, it being that various charurcs may be .made in the details ot construction and. ari-angelilents ot' the ports by those skilled in the art, without departing; from my invention.

lleferring' to the accom partying' drawings, the numeral Q (flesienates the cylinder of the mi" ir, having1 an eccentrically located piston-chamberil. rThe cylinder 2 has open ends, and is seated l'ietween the front andrear heads 4 and 5 which are formed with recesses to receive thc cylinder, the whole being rigidly secured by means of the long screws which extend through the front head 5 and through the wall o't` the cylinder into` the rear head 4l, as best. shown in Fig. 3.

7 designates the rotary piston shaft whichl is journaled at its end Ft?, which are seated in the'front and rear j aeads. These bushings are .flanged at their inner ends, as indicated at 9, and are insorted into the heads trom the inner sides,

portions in bushings the flanges seating in annular recesses of the heads. The forwardly projectingr end ofthe shavtt 7 is threaded as indicated at 1.0, or is otherwise formed, to permit of the attachment o't' the tool to be operated by the motor. lfts rear portion has a shoulder 1l which tits in the recess in the end ot' the rear luis-hing S. The reduced end portion 7 of the shat't extends through the rear bushing 8 into a (.'hauiber 1Q, and is secured against forward ondwise movement by a nut or collar 13 formed therein, or fastened thereon by a pin 14.

15 designates the piston blade which is seatcdjin a slot extending through the piston shaft. This shaft is journaledeccentrically in the chamber 3 and contacts with the wall 'thereof at. one side, between the admission and exhaust ports, as shown in Fig. 5, the edge ot the piston blade maintaining' Contact with the wall of the said chamber at all times.

1G designates a wall or partition in the rear head 4, said partition -formingl the rear wall of the chamber l2 and the front wall otl a chamber 17 also formed in said head.

18 is a reducing nut or bushing which is rcniovabl'l screwed into the rear end ot the rear head. and into which ls threaded a' hose-shank lt), which carries the motor and supplies it, with its motive fluid, preferably air. This shank has a flanged end or head F2() which is arranged to be screwed forward into Contact with the wall or partition 16 to `malte an air-tight joint therewith.

2l is a straining cylinder which is ,located between the inner end of the reducing nut t8 and the wall or partition 16, around the delivery end ot' the hose-shank within the chamber 17, the latter being' preferably cupped or hollowed ont to form an annular depression or groove 22.

23 designates an admission port which cxtends through the thickened .wall of the cylinder 2 and through the rear head 4C into the chamber 17, as most clearly shown in Fig. 1, the forward end of said port being closed except for a communicating oil-passage 24:, which extends into and through the frontI head and is normally closed by a spring-seated valve 25. The admission port 23 is connected with the cylinder chamber 3 by a plurality of cross-ports 2G.

27 is an exhaust port also formed in the thickened wall' of the cylinder 3, said port being closed at its rear end and being continued at its forward end through to the front face of the front head 5, as most clearly shown in Fig. 2. This port communicates lwith the cylinder chamber 3 by means of/a plurality of cross-ports 28.

29 (see Fig. t) is a .lubricant passage, which extends through the front head, through the cylinder Wall, and into the rear head, Where it communicates with the rear bearing of the shaft 7 by a passage 30. This passage 29 is normally closed by a spring valve 31. 32 is a similar Valve also seated in the front head, and which normally closes the lubricant passavo 33 leading to the front bearing of the shatt 7.

Se is an escape opening leading to the atmosphere through the rear head from the chamber 12. This opening permits the es-` cape of any air that may leak past the rear journal of the shaft 7 and Which would otherwise cause forward pressure on the rear end of the shaft and undue friction between the nut or collar 1 3 and the rear bushing 8.

The operation of. the motor is follows: The hose-shank 19y being screwed forwardly against the partitions 16, thereby cutting ott the supply of air to the admission port, the motor is started by holding said shank in one hand and rotating the motor with the ot-her hand in a direction opposite to .that

of the normal running of the shaft 7. This moves the motor foi-ward lon said shank and admits air to the admission port. This position of the motor will be maintained by its reaction While working. The air enters the chamber 17 through the strainer cylinder 21, and thence passes to the admission port 23and through the cross-ports Q6 into the chamber 3, from which it escapes by the rotation of the piston blades through t-hc piston exhaust ports 27 and Q8. The motor stops by holding the hose-shank and rotating the motor in the 'opposite,direction to that in which it is rotated in starting, tlereby bringing the flange end of the hose-shank against the vpartition 16 and cutting 0E the air supply.`

To lubricate the motor, it is held with its front end up, and oilis poured in through the valves Q5, 31 and 32. The oil introduced at the valves' 31 andlSzZ flows to the front and rear journals or bearings' of the shaft 7, while that admitted by the valve 25 Hows through the passage and admission port 23 into the chamber 17, from which it is blown into the cylinder by the air. This method of lubricating the cylinder avoids all possibility of oil get-ting into the hose and damaging the saine. The front head 5 is made to fit neatly in the cleaned section of the boiler tube, so that the motor cannotbe advanced until all. scale has been removed in front of it. For use in straight boiler tubes the rear head is made the same size as the front head to hold the motor parallel and central in the boiler tube.

ln Figs. l1 to 5, inclusive, I have shown the two heads as being of considerably larger diameter than the cylinder 2. This permits the use of the same sized cylinder for cleaning many ditl'erent sizes ofl boiler tubes, by assembling the cylinder with heads of different diameters. An assembled motor ma y be also readily reduced to lit tubes of smaller diameter by turning down their' heads, which are preferably of soft steel. lVorn down heads can be reclaimed by being turned down for use in smaller tubes. The enlarged heads also protect the cylinder, which is preferably of hard steel and is expensive, from wear and injury While at work in the boiler tubes. The force of vthe blows caused by the reaction of the tool is transmitted from the piston shaft directly through these heavy end heads without strain and without wear or loosening of the joints or of the screws which hold the heads and cylinders together. A further impor tant advantage, due to the use of these heavy end heads is that a large proportion of the weight of the motor is thus caused to be located near its ends, which increases the moment of inertia about a transverse axis and enables the motor to meet the reaction of the tool with less movement of and damage to the motor, and with a corresponding increase in the movement and eflcctiveness of the tool.

The use of long screws for connecting the for threads in the hard steel cyli1ider,wlie1e 'they would be ditlicult to form; and the entire construction is such that it is almost impossible for any of the parts to work loose in operation, while at the same time the motor can be i'ery quickly taken apart with no other tools than a screw driver.

ei further advantage of my invention is due to the ability to sluit off the air atathe machine land so stop the motor in chang ing from tube to tube without depending upon signaling an assistant operator. This also eiiects both a saving in time and in labor.

The straining cylinder Q1 acts to catchv all pieces of hose liningor other objects Which might clog the ports or blo-ck the piston blades. This cylinder can be readily removed for cleaning.

A further advantage results trom the construction whereby endwise movement of the piston shaft is prevented, and from the provision ot' the air-vent 84 for relieving presf sure from behind lsaid shaft, which would otherwise tend to cause serious friction and heating.

The rear bushing 8 may be conveniently secured by means or" a. dowel pin 8 seated partly in' the rear head and partly in the" flanged end ot' the bushing, as shown in Fig. 2. l

The modification shown in Fig. (3 is more particularly designed for use in curved tubes.` In this form, the hose-shank l9.is

Iconnected to the reducing bushing 18 by a ball-andsso`cket connection 19", the air cutott at this point not being present in this form. Instead Bof two separate passages for conveying 'lubricant to the 'front and rear bearings, a single passage 29a is provided, having branches 29h, leading respectively to the two bearings. The thrust, instead of being received upon a rear collar as in the :torni first described, is taken care of by the integral shoulder 7 on the piston which bears iiirece'ss inthe front bushing 8, which is formed in' two sect-ions or split. In this form, the fronthead 5 is made ot such diameter as to fit neatly the interior ot' the cleaned tube, but the rear head is made of the same exterior diameter' as the cylin der where the two come together, and is formed with a reduction or taper toward its rear end to give it; sutlieient clearance in the tube to permit the motor to pass a curve therein.

What I claim is l. A rotary motor having an air chamber in its rear head communicating with the 'admission port of the moto-r, and a supply pipe or shank rotatably secured in said head and arranged to be turned into and out,ot contact with the inner wall of said cliztxn'- ber; substantially as described.

2. A rotary motor having an air cham4 bei' iii its rear head communicating with the admission portot the motor, a threaded bushing in the rear end ot' said chamber, and a threaded supply pipe or shank seated :in the said bushing and having a valve end arranged to be screwed into and ont ot' conf tact with the "inner wall oi said`chainber; substantially as described. i

3. A rotary motor having an air chainber in its rear head, an admission port coniniunieating with said chamber, a bushing closing the rear end ofsaid chamber, a sup-- plyport through said bushingand leading into said chamber, and an annular strainer carried by said bushing and located 4in said chamber surrounding the delivery of the supply passage.

4. A rotary motor having a rear head provided with a shaft bearing, a trent head also having a sha tt. bearing, and lubricant passages in the front head, said passages heads, the rear head having a chamber coniniunieating with the air supply for rthe motor and also with the interior of the cylinder, and the front head having a lubrilant passage extending therethrough and through the cylinder wall and rear head to vthe said chamber; substantially as described.

G. A rotary motor having al cylinder, a head closing an end of said cylinder, a piston shaft extending through said cylinder, and a removable bushing 'in said heading toi-ming a bearing tor said shaft. said bushing having a flanged or shouldered inner end lying in a recess of the head and extending radially under the end i'ace of the cylinder.

7. A rotary motor having a cylinder, a head closing an end ot said cylinder, a piston sha t'textending through said'eylinder, a removable bushing in said head forming a bearing for'snid shaft,f said bushing having a flanged or shouldered inner end. lying in a recess oli-the head andextending radi ally under the end face ot the cylinder, and a dowel itting in matching groovesin the head and bushing and having its inner end covered by the end face of the cylinder.

S. A rotary motor having front and rear heads, a cylinder between said heads,` long screws connecting the cylinder and heads, a piston sha'it extending through the cylinder, and removable bushings in said heads Aforming bearings -for the said shaft, said bushings haring flanged or shouldered inner ends engaging recesses rt/the head and extending radially under the vend faces o'l the cylinder; substantially as described.

t). rotary motor havingront and rear heads, a cylinder secured between the heads, a piston sha'tt journaled iii the heads, a collar on the rear end oit said shaft behind its bearing, an air-chamber surrounding said collar, and means torrenting the air chamber; substantially as described.

10. In a rotary motor, a piston shaft, a rear bearing for said shaft, and an air-'space adjacent, to said bearing, said shaft having a shoulder forming a thrust bearing against the `front wall of said air-space; substantially as described.

11. 4In a rotary motor, a piston shaft,` a rear bearing for said shaft, an airspace adjacent to said hearing, said shaft having a shoulder forming a thrust bearing against the front Wall of said air-space, and means for vent-ing Said space; substantialiy as described lf2. In a motor, si Cylinder hit-ving u longitudinally extending admission port, a, head :it one`iid of the Cyliiiderhaving an admission chamber therein, a supply pipo extending into the admission ohaiiiber, and means for filtering the air entering said Chamber from said pipe; substantially as described. 10 In testimony whereof, I have hereunto Set my hand.

PHILIP J. DARLINGTON.

Vitnesses l GEO. B. BLEMING, GEO. H. PARMELEE. 

